Question

Three elements X,Y,Z have atomic number 7,8,9 respectively
I) State their position ( Group No. and Period No.) in Modern Periodic Table
ii) arrange the elements in decreasing order of their atomic radii.
iii) write the formula of compound formed when X combines with z
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Answer 1

Answer:

i, group no.7 period. 2

group no.8,period 2

group no.9,period 2